Use of insecure cipher mode such as ECB
is not recommended for use in cryptographic protocols at all.
In case of ECB
, it encrypts identical plaintext blocks into identical ciphertext blocks; and does not hide data patterns well. In some senses, it doesn't provide serious message confidentiality.
Read more about different cipher modes here -- https://cryptography.io/en/latest/hazmat/primitives/symmetric-encryption/#module-cryptography.hazmat.primitives.ciphers.modes