A management system comprising: a key generation device; and an in-vehicle computer which is installed in a vehicle, wherein the key generation device includes a vehicle interface configured to transmit and receive data to and from the vehicle, a key generation unit configured to generate a first key and a second key which are stored in the in-vehicle computer, an expected value calculation unit configured to calculate an expected value of stored data which is stored in advance in the in-vehicle computer using the second key, and a cryptographic processing unit configured to encrypt the first key with an initial key which is stored in advance in the in-vehicle computer to generate first encrypted data, encrypts the second key with the first key to generate second encrypted data, and encrypts the expected value with the first key to generate fourth encrypted data, wherein the first encrypted data, the second encrypted data and the fourth encrypted data are transmitted to the vehicle through the vehicle interface, and wherein the in-vehicle computer includes an interface unit configured to transmit and receive data to and from a device outside of the in-vehicle computer, a cryptographic processing unit configured to decrypt the first encrypted data received from the key generation device through the interface unit with the initial key which is stored in advance in the in-vehicle computer to acquire the first key, decrypt the second encrypted data received from the key generation device through the interface unit with the acquired first key to acquire the second key, and decrypt the fourth encrypted data received from the key generation device through the interface unit with the acquired first key to acquire the expected value, and a measurement unit configured to calculate a measured value of the stored data which is stored in advance in the in-vehicle computer using the acquired second key, and verify the measured value on the basis of the acquired expected value, wherein a verification result for the measured value is transmitted through the interface unit. a key generation device; and an in-vehicle computer which is installed in a vehicle, wherein the key generation device includes a vehicle interface configured to transmit and receive data to and from the vehicle, a key generation unit configured to generate a first key and a second key which are stored in the in-vehicle computer, an expected value calculation unit configured to calculate an expected value of stored data which is stored in advance in the in-vehicle computer using the second key, and a cryptographic processing unit configured to encrypt the first key with an initial key which is stored in advance in the in-vehicle computer to generate first encrypted data, encrypts the second key with the first key to generate second encrypted data, and encrypts the expected value with the first key to generate fourth encrypted data, wherein the first encrypted data, the second encrypted data and the fourth encrypted data are transmitted to the vehicle through the vehicle interface, and wherein the in-vehicle computer includes an interface unit configured to transmit and receive data to and from a device outside of the in-vehicle computer, a cryptographic processing unit configured to decrypt the first encrypted data received from the key generation device through the interface unit with the initial key which is stored in advance in the in-vehicle computer to acquire the first key, decrypt the second encrypted data received from the key generation device through the interface unit with the acquired first key to acquire the second key, and decrypt the fourth encrypted data received from the key generation device through the interface unit with the acquired first key to acquire the expected value, and a measurement unit configured to calculate a measured value of the stored data which is stored in advance in the in-vehicle computer using the acquired second key, and verify the measured value on the basis of the acquired expected value, wherein a verification result for the measured value is transmitted through the interface unit.