See the following sketch. Ciphertext repetitions represent an inherent weakness in the basic encryption algorithm. In general, the lower the repetitions factor, the better the scrambling of data and less available are repetitions to feed to the cryptanalysis for an analysis advantage. The entropy calculation is an important measure of predictability and organization. If entropy is low the data is well organized, and orderly.
Higher entropy indicates a stronger level of obfuscation of data.
The closer the observed cipher text is to random text, the more difficult it is to recover the original plain text. ICSA Labs certifies security products that use cryptography. ICSA Labs certifies that the product uses industry-accepted algorithms to provide the security features and the algorithms are implemented and used without introducing security degrading errors that are detectable by our certification examination and testing process. Among the methods used to determine whether a product's implementation doesn't degrade the security of the product are attestation, demonstration, testing, and verification. Then the implementation or use of that feature would not prevent Certification.