go/doc/next/6-stdlib/99-minor/crypto/cipher/69445.md

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[NewOFB], [NewCFBEncrypter], and [NewCFBDecrypter] are now deprecated. OFB and CFB mode are not authenticated, which generally enables active attacks to manipulate and recover the plaintext. It is recommended that applications use [AEAD] modes instead. If an unauthenticated [Stream] mode is required, use [NewCTR] instead.